The sentence echoes the case of British-Iranian mother Nazanin Zaghari-Ratcliffe, who was jailed for five years in 2016 on spying charges.
The arrest comes after two other British-Iranians were detained in recent weeks.
Time is running out to apply.
British Council Boss In Row After Commenting On Facebook Meme Calling Prince George A 'F**king D**khead'
The Queen is a patron of the organisation